Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Consolidated Statements Of Operations [Abstract]
Revenues	$ 107,182	$ 57,069	$ 186,691	$ 109,866
Cost of sales (excluding depreciation and amortization)	83,111	42,738	141,291	84,494
Gross profit	24,071	14,331	45,400	25,372
Operating expenses:
General and administrative	16,705	13,670	32,339	26,714
Selling, marketing and service	2,973	2,466	5,721	4,475
Depreciation and amortization	$ 2,612	2,137	5,089	4,315
Restructuring charges				427
Total operating expenses	$ 22,290	18,273	43,149	35,931
Operating income (loss)	1,781	(3,942)	2,251	(10,559)
Other income and (expenses):
Interest income and other income	2	5	3	9
Interest expense	(287)	(292)	(556)	(592)
Income (loss) before income taxes	1,496	(4,229)	1,698	(11,142)
Income tax expense (benefit)	625	(1,481)	706	(4,135)
Net income (loss)	$ 871	$ (2,748)	$ 992	$ (7,007)
Earnings (loss) per share:
Basic	$ 0.04	$ (0.12)	$ 0.04	$ (0.32)
Diluted	$ 0.04	$ (0.12)	$ 0.04	$ (0.32)
Weighted average common shares outstanding during the period:
Basic	22,450	22,346	22,418	22,164
Diluted	22,592	22,346	22,544	22,164